Hot-blast valve



Oct. 12, 1943. G. FOX

HOT BLAST VALVE Filed Dec. 15, 1941 2 Sheets-Sheet l INVENTOR. v Gordon Fox Oct G. FQX 2,331,465

HOT BLAST VALVE Filed Dec. *15, 1941 2 Sheets-Sheet 2 1 N VENTOR. Gordon Fox Patented Oct. 12, 1943 HOT-BLAST VALVE Gordon Fox; Chicago, Ill., assignor to Freyn En-- gineering Company, Chicago, 111., a corporation of Maine Application December 15, 1941, Serial No. 423,032

' 4 Claims. (01. 251-168).

The present invention in hot blast valves.

More particularly the present invention relates to valves such as are used in conjunction relates to improvements 'with conduits for carrying hot air and hot gas to and from'a blast furnace. Such valves commonly have water-cooled seats, as well as a water-cooled closure member or gate. However, such valves as now known and used are subject to attack at the region between the water-cooled seats.

An object of the present invention is to provide an improved hot blast valve provided with means for protecting the parts thereof which are not sufiiciently protected by the water-cooling features thereof. r v

A further object is to provide a hot blast valve having relatively simple means for protecting the region between the valve seats,which region is ordinarily subjectedto high temperatures.

' A further object is to provide a hot blast valve welladapted to meet-the needs of commercial operation.

.Further objects will appear as the description proceeds.

Referring to the drawings- Figure l is a sectional view illustrating a hot blast valve embodying the principles of the present invention, said view being taken along a vertical plane which includes the axis of the passageway through said valve;

Figure 2 is a sectional view taken along the plane indicated by the arrows 2-2 of Figure 1;

Figure 3 is a fragmentary view on an enlarged scale of a portion of Figure 2; and

Figure 4 is a sectional view on an enlarged scale showing part of the structure illustrated in Figure 1, said Figure 4 being taken along the planes indicated by the arrows 4-4 of Figure 2.

The hot blast valve chosen for illustration includes the casing Ill having the flanges l!ll by means of which said casing may be secured intermediate of the length of a conduit for carrying hot air and hot gas. Mounted upon the casing I is the top portion H2. The upper extremity of the casing I!) forms, with said top portion l2, a recess adapted to receive the gate l3 when said gate is moved into valve opening position. Said gate i3 is ordinarily hollow, and is provided with means forming water passageways for the flow of water therethrough. Pipes I4 and I5 ordinarily serve the dual purpose of providing lifting means for the gate I3 and for providing for the ingress and exit of Water to the interior of said gate I3.

sponding shoulder 29.

The casing i0 is provided with two-Watercooled seats I 5-46 spaced apart a distance to :permit sliding therebetween of the gate I3. .Any preferred means may be provided for securely holding the valve seats IBl t in proper relation.- shipwith the casing l0 and with the gate l3.

As indicated in Figure 2,'the portion ll of the casing Ill adjacent to the valve seats iii-l6 is of generally circular contour. The portion '11, between the valve seats I6 l this provided with the recesses lB-iS, each of said recesses 58 terminating at a corresponding shoulder It at one of its extremitiesabove the level of the axis of the valve and at a corresponding shoulderZfl adjacent to the lowermost portion of the casing ill.

The side walls of the recesses l8 l8 are provided with the slots 2l2l of arcuate contour facing each other.. Astrip of metal 22 is located within each pair of slots 2l2i, one extremity of each of the strips 22-22 being secured, as for example by means of welding, to a corre- The other extremity of each of the strips 22-22 may have overlying relationship with a corresponding shoulder l9. Said strips 22-22 in conjunction with their corresponding recesses provide passageways for air, as will be described presently. Each of thes'trips 22 has a loose fit within its corresponding pair of slots 2!, and by reason of the fact that each of said strips 22 is anchored at only one of its ends, expansion is permitted in width, thickness and length.

The valve casing I0 may be provided with the abutments 23-23, each underlying a corresponding strip 22. The bottom portion of the gate I3 may be provided with corresponding .abutments 2424 adapted to engage the strips 22-22 at regions adjacent to the abutments 2323. Communication with each of the recesses 18 adjacent to the lowermost portion of the valve casing I0 is in an air inlet 25. It is possible to introduce a small amount of air through these air inlets 2525, which air passes through the recesses l8l8, being discharged into the gas or air stream at the upper extremities of said recesses l8i8. The volume of air passing from the air inlets 2525 through the recesses Iii-I8 may be so small that it does not have any appreciable influence upon the gas or air stream passing axially through the valve casing l8. However, the air passing through said recesses iii-l8 does serve as a cooling medium for the strips 22-22.

The strips 22-22 serve as shields to protect the circumferential wall of the valve casing ID at the region intermediate of the water-cooled valve of the valve casing i0 disposed outwardly of said strips.

The strips 22-22 may be made of special steel, or other metal available commercially, adapted to withstand successfully the high temperature attained by these strips.

By reason of the present invention, excessive temperature of the valve casing is avoided, and distortion of said casing with resultant leakage is flVOidCd.

Thougha preferred embodiment of the present invention has been described .in detail, many modifications will occur. to those skilled in the art. It isintended to cover-all such modifications that fall within the scope of the appended claims.

What is claimed-is:

i. In a valve, in combination, a valve casing providing an axial passageway, a gate slidably mounted in saidcasing to control said axial passageway,- said casing being provided with a watercooled seat, and a stripof heat-resisting metal mounted in said casing adjacent to said seat but axially displaced therefrom in protective relationship with the wall of said casing adjacent to mounted in said casing to control said axial passageway, said casing being provided with a pair of water-cooled seats spaced apart a distance sufflcient to receive said gate, the wall of said casing being provided with a pair of circumferential recesses, strips of heat resisting material, each having an extremity secured to said wall and each covering its corresponding recess to form a passageway, the other extremities of each of said strips being supported by said wall but free to move upon said wall, each of said passageways being open to a supply of air at one of its extremities and being open to said axial passageway at the other of its extremities, said wall in the regions of said recesses being provided with abutmerits underlying said strips, said gate being provided with abutments adapted to engage said strips at regions adjacent to said first-mentioned abutments.

4. In a valve, in combination, a valve casing providing an axial passageway, a gate slidably mounted in said casing to control said axial passageway, said casing being provided with a pair of water-cooled seats spaced apart a distance suflicient to receive said gate, the wall of said casing being provided with a pair of circumferential recesses, strips of heat resisting material, each having an extremity secured to said wall and each covering its corresponding recess to form a passageway, the other extremities of each of said strips being supported by said wall but free to move upon said wall.

, GORDON FOX. 

